The Gold and Silver proof coins share the same design and come with the following description on the website:

2015 Proof Coin Lunar Series Year of the Goat

The Chinese Zodiac, Sheng Xiao, is a twelve-year cycle, with each year represented by an animal with a unique personality. If you were born under this sign, you are likely to possess elegance, charm and kindness. Packaged in a stunning presentation case, this coin features a design of three goats surrounding plum blossoms, which symbolise hope, prosperity, purity and renewal in spring.

And the images:

It's a pretty nice design actually. The Silver coins come in various sizes, 11.66 grams (mintage 10,000), 1 ounce (mintage 5,000), 5 ounces (mintage 500) and 1 kilogram (mintage 500). Last year they changed up the design between the different sizes, but appear to have standardised them this year, using the same design across all sizes. A mintage of 500 coins for the 5oz coin is quite low (it was 5,000 last year) and the price point of A$320 for the coin is much better than the Perth Mint's circa $480-500 price tag for their coins this size. May be worth giving this RAM coin some consideration.

There is also the 1/10oz Gold coin available which has a mintage of 1,500. It doesn't appear they are doing a 1oz Gold coin (at least one hasn't been listed on the website yet).

Along with the standard proof coins above they also do the Tetra-decagon Goat Coin which comes in both Silver (1/2oz) and CuNi. Both have unlimited mintage. I really liked the Tetra-decagon Horse & Snake Lunar Coins so it was a little disappointing to see the goat design which I am not as fond of:

If you are interested in pre-ordering the Royal Australian Mint Lunar Goat Coins you can do so at the Mint e-shop.